4.The superposition of mechanical waves can be observed in the movement of A. Bumper cars B. Water waves in a ripple tank C. Electromagnetic radiation D. A football thrown through the air

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4.The superposition of mechanical waves can be observed in the movement of A. Bumper cars B. Water waves in a ripple tank C. Electromagnetic radiation D. A football thrown through the air

Physics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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7.A musical tone sounded on a piano has a frequency of 261.6 Hz and a wavelength of 1.31 m. What is the speed of the sound wave? A. 646 m/s B. 34.3 m/s C. 243 m/s D. 343 m/s 8.Bats chirp at high frequencies that humans cannot hear. They use the echoes to detect small objects, such as insects, as small as one wavelength. If a bat emits a chirp at a frequency of 60.0 kHz and the speed of sound waves in air is 340 m/s, what is the size in millimeters of the smallest insect that the bat can detect?
I need help. These are the only questions I can't figure out.
for 6, have a go first for 7 & 8 use \[v = f \ \lambda\]

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Would 4 be B? And with seven and eight, I just need to know how to figure it out. This is literally my first class in physics since elementary school -my school is crappy- so I barely have the basics of physics.
For the 4th it's B ! Ripple tank !
Regarding 7th and 8th ... Actually there's a standard equation \[V = f \lambda\] V= Velocity f= Frequency and the other symbol stands for the wave length

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